Make use of new list primitives list_append_unique and list_concat_unique

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 5d27bf20b482ca7d1bd206da49bd6495d783bc71
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2005-07-28T22:27:02Z
Releases: 8.1.0
Make use of new list primitives list_append_unique and list_concat_unique
where applicable.

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